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SpaceX Starship Program / Re: Elon The Boring Company - Tunnel 2
« Last post by spacenut on Today at 05:28 pm »
A waterproof tunnel could be installed to offshore launch sites.  Liquid methane, and liquid oxygen, as well a nitrogen could be installed in the tunnel.  This would allow access in case of any problems.  However it would probably be cheaper to just install the pipelines on the sea floor to the launch sites.  They could also use a hover craft from the beach to the launch sites. 

Tunneling at Starbase could allow traffic to move when the road was closed for transport of a Starship or booster. 
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General Discussion / Re: Flight crew assignments
« Last post by John_Marshall on Today at 05:22 pm »
In other news, https://www.gctc.ru/main.php?id=155 has been updated, and there's some interesting stuff there. Aleksei Zubritskiy is now the backup FE1 for MS-26 even though Sergey Mikaev is still the prime FE1 for MS-27, and Jonny Kim is Don Pettit's backup.

The link below this paragraph (I hope Google Translate works) seems to imply that Sergey Mikaev is now on the same crew as Sergei Kud-Skverchkov, which would mean that Zubritskiy is now on the MS-27 prime crew and that Mikaev is now on the backup crew.

https://forum-novosti--kosmonavtiki-ru.translate.goog/index.php?PHPSESSID=ijsvpuu3pbmhmnlgfcn5ac8ff6&topic=4005.1300&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=nui
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I missed this when it came out but it's a good interview with Eric Berger about the future of the Artemis program:

Interesting how the "increased cadence" puts Artemis III back to  2028, Per Eric, in that interview.

From the oracle:

https://en.wikipedia.org/wiki/Artemis_3

Quote
Office of Inspector General audit reported a conclusion that the spacesuits would not be ready until April 2025 at the earliest, likely delaying the mission from the planned late 2024 launch date ... In June 2023, Jim Free, NASA's associate administrator for exploration systems development, said that launch would "probably" be no earlier than 2026. Later in December 2023, the GAO reported the mission was unlikely to occur before 2027
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Historical Spaceflight / Re: DC-X Program
« Last post by laszlo on Today at 05:20 pm »
Great video Mr. Tumlinson.
The airliner scene should have been recycled for the hundreds of times the Gwynn and Elon used that analogy.
At 1:29 minutes or so the background music sounds a lot like the intro to StarTrek DS9. 
Coincidence, or just my fevered imagination?
The flight paths do look a lot like Starship SN1 though SN15.
This video shows exactly why SpaceX's announcements about their plans had so many of us who were able to remember the 90's saying move on, nothing new to see here. Fully reusable - check. VTOL - check. Rapid prototyping - check. Airliner style operations goal - check.

It's also why all that crap about Old Space vs. New Space was so condescending and insulting. "Old Space" actually came up with the ideas and executed them as far as funding would allow while Elon Musk was still just a university student.  DC-X stalled not because of its final hard landing, but because the federal government stopped funding it. And it was in the early days of the computer revolution.

Sure, the need to replace SSTO with TSTO was lurking in the shadows, but DC-X in the 90's did everything Starhopper did 20 years later. It's only in the 2020's that Starship began to surpass DC-X.

The music, BTW, is Aaron Copland's Fanfare for the Common Man, from 1942. The choice followed the theme of Space for the Common Man. Its influence is all over the place - movies, TV, etc.
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It does feel as if the thrust of this article hinges on a rather nuanced reading of a single sentence.

Dang it!

Which one?
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But it is noteworthy that we can even contemplate such possibilities with Shelby gone.

If it ever comes, I still think Artemis reform would have to start at the White House.  But I would love, love to be proven wrong by a top cardinal like Murray.

I had wondered if Shelby was helping or hurting the return to the Moon.
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Time travel is literal nonsense, and there is no way to make it work that doesn't fundamentally break logic.

That was a great Veritasium video.  Two questions, one of which has little to do with space and such.

Suppose there's a box, one side of which is full of the little circles in the video. Doesn't entropy suggest that over time, the circles spread roughly evenly thruout the box?  If you wait long enought, tho, wouldn't the little circles all find themselves back on the original side of the box?

Secondly, most of our proteins are left handed:

https://www.science.org/content/article/why-are-all-proteins-left-handed-new-theory-could-solve-origin-of-life-mystery

How then, do these left handed proteins create symmetrical body plans with both left handed and right hands?

I just have an intuition that chirality plays a part in CPT theory and somehow plays a part regarding time.

Also, I don't want to sidetrack the thread; this is just a question which occured to me and I thought others might benefit from a brief side trip.
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SpaceX Starship Program / Re: Elon The Boring Company - Tunnel 2
« Last post by EL_DIABLO on Today at 04:33 pm »
Seems some tunneling will be needed long term, especially once they start launching off shore.

Why would tunneling be needed for off shore launches?
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Quote from: SpaceX
Upgrades derived from the flight test will debut on the next launch from Starbase on Flight 4, as we turn our focus from achieving orbit to demonstrating the ability to return and reuse Starship and Super Heavy. The team incorporated numerous hardware and software improvements in addition to operational changes including the jettison of the Super Heavy’s hot-stage adapter following boostback to reduce booster mass for the final phase of flight.

The third flight of Starship provided a glimpse through brilliant plasma of a rapidly reusable future on the horizon. We’re continuing to rapidly develop Starship, putting flight hardware in a flight environment to learn as quickly as possible as we build a fully reusable transportation system designed to carry crew and cargo to Earth orbit, the Moon, Mars and beyond.
https://www.spacex.com/updates/#flight-3-report

So no reuse of the hot-stage adapter? Hopefully that is a temporary measure.

I’ve noticed talk about a Soyuz-type interstage in the works. Since the interstage is one piece without mechanisms, sensors etc., it should be cheaply expendable while the designers iterate to something more than 99% reusable.

They might possibly go to something like they implemented for F9 fairing halves: add some deployable flotation and pick flown units out of the water. Economics will dictate whether that is worth the cost increment.
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The number of person-hours they're spending on attending to tiles on that ship does not suggest that this is the way of the future.
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